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प्रश्न
Fill in the blank.
The process of a liquid changing into a solid is called ________
उत्तर
The process of a liquid changing into a solid is called freezing.
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संबंधित प्रश्न
Write true or false for the statement
Decomposition of leaves is a fast change.
Chemical changes are accompanied by changes in energy.
State the various conditions that favour the process of evaporation.
What are reversible and irreversible changes ? Give one example for each.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
